This is the 18005th most frequent Russian word.
финалах
"Финалах" means "finals" (plural, referring to the final stages of competitions).
The word 'финалах' is used to indicate the plural form of 'final' in the prepositional case, referring to multiple finals in events.
Многие популярные спортсмены участвовали в финалах мирового чемпионата.
Many popular athletes participated in the finals of the world championship.
Here 'финалах' again describes the location (prepositional case) within several final stages of competitions.
Он всегда мечтал о своей победе в финалах спортивных соревнований.
He always dreamed of his victory in the finals of sports competitions.
In this case, 'финалах' specifies the contextual time and place of finals, indicated by the prepositional case.